Made MD* libraries (Parola, MAX72XX) project specific, to be able to use the newest software version from github.
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// Use the MD_MAX72XX library to Print some text on the display
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//
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// Demonstrates the use of the library to print text on multiple lines
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// by using separate matrix displays (no zones). The DAT and CLK lines
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// are shared with one LD/CS per string of matrix devices
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//
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// User can enter text on the serial monitor and this will display as a
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// message on the display.
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#include <MD_MAX72xx.h>
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#include <SPI.h>
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#define PRINT(s, v) { Serial.print(F(s)); Serial.print(v); }
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#define BUF_SIZE 75 // text buffer size
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#define CHAR_SPACING 1 // pixels between characters
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// Define the number of devices we have in the chain and the hardware interface
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#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
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#define MAX_DEVICES 4
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struct LineDefinition
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{
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MD_MAX72XX mx; // object definition
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char message[BUF_SIZE]; // message for this display
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boolean newMessageAvailable; // true if new message arrived
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};
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// Add new entries for more lines.
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// NOTE: These pin numbers will probably not work with your hardware and may
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// need to be adapted
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struct LineDefinition Line[] =
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{
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{ MD_MAX72XX(HARDWARE_TYPE, 11, 13, 10, MAX_DEVICES), "abc", true },
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{ MD_MAX72XX(HARDWARE_TYPE, 11, 13, 9, MAX_DEVICES), "def", true }
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};
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#define MAX_LINES (sizeof(Line)/sizeof(LineDefinition))
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void readSerial(void)
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{
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static int8_t putIndex = -1;
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static uint8_t putLine = 0;
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char c;
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while (Serial.available())
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{
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c = (char)Serial.read();
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if (putIndex == -1) // first character should be the line number
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{
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if ((c >= '0') && (c < '0' + MAX_LINES))
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{
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putLine = c - '0';
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putIndex = 0;
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}
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}
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else if ((c == '\n') || (putIndex >= BUF_SIZE-3)) // end of message character or full buffer
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{
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// put in a message separator and end the string
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Line[putLine].message[putIndex] = '\0';
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// restart the index for next filling spree and flag we have a message waiting
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putIndex = -1;
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Line[putLine].newMessageAvailable = true;
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}
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else
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// Just save the next char in next location
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Line[putLine].message[putIndex++] = c;
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}
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}
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void printText(uint8_t lineID, uint8_t modStart, uint8_t modEnd, char *pMsg)
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// Print the text string to the LED matrix modules specified.
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// Message area is padded with blank columns after printing.
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{
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uint8_t state = 0;
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uint8_t curLen;
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uint16_t showLen;
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uint8_t cBuf[8];
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int16_t col = ((modEnd + 1) * COL_SIZE) - 1;
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Line[lineID].mx.control(modStart, modEnd, MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
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do // finite state machine to print the characters in the space available
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{
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switch(state)
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{
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case 0: // Load the next character from the font table
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// if we reached end of message, reset the message pointer
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if (*pMsg == '\0')
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{
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showLen = col - (modEnd * COL_SIZE); // padding characters
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state = 2;
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break;
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}
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// retrieve the next character form the font file
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showLen = Line[lineID].mx.getChar(*pMsg++, sizeof(cBuf)/sizeof(cBuf[0]), cBuf);
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curLen = 0;
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state++;
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// !! deliberately fall through to next state to start displaying
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case 1: // display the next part of the character
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Line[lineID].mx.setColumn(col--, cBuf[curLen++]);
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// done with font character, now display the space between chars
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if (curLen == showLen)
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{
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showLen = CHAR_SPACING;
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state = 2;
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}
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break;
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case 2: // initialize state for displaying empty columns
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curLen = 0;
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state++;
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// fall through
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case 3: // display inter-character spacing or end of message padding (blank columns)
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Line[lineID].mx.setColumn(col--, 0);
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curLen++;
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if (curLen == showLen)
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state = 0;
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break;
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default:
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col = -1; // this definitely ends the do loop
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}
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} while (col >= (modStart * COL_SIZE));
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Line[lineID].mx.control(modStart, modEnd, MD_MAX72XX::UPDATE, MD_MAX72XX::ON);
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}
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void setup()
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{
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Serial.begin(57600);
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Serial.print("\n[MD_MAX72XX ");
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Serial.print(MAX_LINES);
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Serial.print(" Line Message Display]\n");
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Serial.print("\nType a message for the scrolling display\nStart message with line number\nEnd message line with a newline");
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for (uint8_t i=0; i<MAX_LINES; i++)
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Line[i].mx.begin();
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}
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void loop()
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{
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readSerial();
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for (uint8_t i=0; i<MAX_LINES; i++)
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{
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if (Line[i].newMessageAvailable)
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{
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PRINT("\nProcessing new message: ", Line[i].message);
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printText(i, 0, MAX_DEVICES-1, Line[i].message);
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Line[i].newMessageAvailable = false;
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}
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}
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}
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